Other action saw Carolina Garcia, the world No. 4 and the defending champion here in Beijing, needing a tiebreak but taking out Polona Hercog in straight sets: 7-6 (2), 6-3.

Wuhan Open runner-up Anett Kontaveit rebounded from a set down to take out Laura Siegemund: 2-6, 6-3, 6-2.

Finally, the night session saw a tough-as-nails Arnya Sabalenka, fresh off snatching the trophy at the Wuhan Open, continue her fantastic run of form with a 7-5, 6-4 win over world No. 14 Gabrine Muguruza.

Turning over to the men's side, no. 3 seed Grigor Dimitrov of Bulgaria triumphed over lucky loser Tennys Sandgren 7-5, 6-3.

Both players were strong on serve, with Sandgren notably serving eight aces during the course of the match. Dimitrov managed to break Sandgren in the decisive final game to take the first set.

The 2017 China Open semifinalist then raced into a 3-0 lead at the start of the second set and thereafter held the American at arm's length to see out the match in one hour 24 minutes.

Dimitrov's third round opponent this year will be Serbian qualifier Dusan Lajovic, who secured safe passage after beating Canada's Vacek Pospisil 2-6, 6-4, 6-4.

The next match saw No. 1 seed Juan Martin del Potro defeat Spain's Albert Ramos 7-5, 6-2.

Del Potro trailed 2-1 in the first set, but rebounded to take the next three games to pull ahead 4-2 using that clearance to seal the first set.

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